Miko wonders which of her friends can run the fastest. She decides that a race, starting at the maple tree and ending at the oak tree, will answer her question. Which variable(s) is she planning to control?

Scientists who study people should be aware that:

Scientists collect evidence by making _________.

Today a clinical trial of a new medicine would most likely include:

A school is about to buy laptops. Which of the following information about the laptops is qualitative?

Which of the following structures is part of the human respiratory system?

An important function of the digestive system is to:

When coronary arteries become completely clocked, the result is often:

For food to be absorbed by our body, which of the following must occur?

Which of the following is an involuntary risk factor for heart disease?

The sound of the heart (lub-dub) is caused by:

Blood transports:

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